Milling cutter



Feb. 4, 1941. G, F, WHITMAN 2,230,662

MILLING CUTTER Filed May 24, 1939 NVENTOR George F Wi ima/1 ATTORNEYSPatented Feb. 4, 1941 MILLING CUTTER George Whitman, Rockford, Ill.,assigner to Barber-Colman Company. Rockford, lll., a corporation ofIllinois Application May ze, 1939, serial No. 215,352

8 Claims.

The invention relates to milling cutters and more particularly toimprovements in interlocklng milling cutters, the invention beingespecially applicable to interlocking side milling cutters.

Interlocking side milling cutters heretofore available have u suallyein-bodied two disk shaped sections secured together in face-to-facerelation by interlocking projections on them, and each 10 having aseries of radially extending teeth presenting peripheral cutting edgesand with allor part of the teeth presenting side cutting edges. Suchcutters are particularly vwell adapted for deep slotting work Where theslot width is to be held to close limits. The interlocking feature makespossible the accurate maintenance of width even after sharpening, andalso spreading, of the cutter for use in diierentwidths of cuts. In suchcutters heretofore available, however, the peripheral cutting edges ofcorresponding teeth 4 on the two sections have been angularly disposedwith respect to each other, thereby forming pockets which obstruct freechip iiow which results .in breakage.

The general object of the present invention is to provide an improvedinterlocking milling cutter embodying a novel tooth arrangement of suchcharacter that a free flow of chips is obtained, there being no pocketsin the cutter periphery which tend to collect chips and cause `breakageof the cutter.

A more specific object is to provide an interlocking milling cutter ofthe type embodying two interlocked and axially alined sections with a3,-, series of teeth on the periphery or each, and

in which a free iiow of chips is achieved by forming generally spirallyarranged'peripheral cutting edges on the teeth of each section and withthe peripheral cutting edge of each tooth in one sec- 40 tion spiralingin the same direction as that on a corresponding tooth on the -othersection and generally alined with it.

Further objects and advantages of Ithe invention will become appa-rentas the following description proceeds, taken in connection with theaccompanying drawing in which:

Figure 1 isa perspective view of an interlocking side milling cutterembodying the invention. Y

Fig. 2 is a front elevation of 'the cutter of Fig. 1.

For purposes of exemplificatlom the invention hasbeen disclosed hereinas embodied in an interlocking side milling cutter (Fig. 1) suitable forcutting slots or grooves. It .will be understood, however, that theinvention may be embodied in cutters of various other specic forms.Accordingly, even though one particular embodiment of the invention hasbeen shown and described in some detail, there is no intention tothereby limit the invention to such embodiment, but, on the other hand,the appended claims are intended .5 to cover all modlcations andalterative constructions falling within the spirit and scope of theinvention. Y

In the illustrative construction (Fig. 1) the cutter shown comprises twoaxially alined disk 10 shaped sections, designated generally as i9 andil.. The section -l has a web body `I2 and a hub portion I3 in which isformed a mounting bore it provided with a keyway i6. The other sectioni! is similarly constituted. The two sectionsv l5 are ganged together,i. e., keyed on a common arbor (not shown) in side-by-slde relation. Topermit adjustment of .the cutter width by shifting the sections axiallywith respect to each other, the .two sections I0 and il are securedtogether 20 by .the usual form of interlitting "projections commonlyused in interlocking side milling cutters. In particular, a series ofradially extending ribs i6 (Fig. 2) are fashioned on the inner4 face ofthe section l0 and theseribs are received 25 in mating grooves l1 in theother section ll.

The periphery of each of the cutter sections l0 and il is provided witha series of teeth so arranged with respect to .the teeth on the othersection that there will be no pockets formed be- 30 tween them in whichchips may become'lodged. To minimize chattering and vibration at highspeeds the peripheral cutting edges on the successive teeth of eachsection are spiraled in opposite directions. This gives a positivecutting edge to the side teeth. In the illustrative construction theteeth i8 on the section 'l0 are defined by two sets of gash i9 and 26alternating with each other and-splraled in opposite directions.V On theother section il two correspond- 40 ing sets of gashes i9a and 20*deiine corresponding teeth Isa, the sets of gashes on the section Ilbeing alined with and spiraled in the same direction as thecorresponding gashes on the section Ill.y 45

Peripheral cutting edges 2l and 2la on the teeth I8 andnlaa respectivelyare formed by sultably relieving the tops of the teeth. In this wayperipheral cutting edges are formed on the cutter structure which spiralalternately-in right and left hand directions and which in each caseextend substantially across the entire cutter. Upon reference to Fig. 2it willV be seen that the cutting edges are so located that the leadingone of each of the generally alined pairs of cutting edges isdisplacedslightly in advance of the other cutting edge in the pair. Thisfurther prevents chip clogging in the event of variations in axialdisplacement oi' the two cutter sections 5 upon adjustments fordifferent widths of slots. In order to accommodate proper cutting withthe sections I andy il shimmed apart in the usual way for adjustment ofthe width of cut, the teeth on each section are arranged in staggered l0relation. For this purpose chip clearance bevels 22 (Fig. 1) are formedon the opposite sides of alternate teeth.

Side cutting edges 23 are fashioned on the outer sides of alternateteeth of the section lo l by suitably grinding ang relieving the same.

Similar side cutting edges 23 (Fig. 2) are also formed on the outersides of alternate teeth on the other section Il. These side cuttingedges project laterally of the hubs I2 so as to accommodate the cuttingof deep slots.

With the construction described above it will be apparent that thecutter has no peripheral pockets. The chips which are formed flow freelyfrom the matching alternate left and right hand 25 spiral cutting edgeson the two sections so that breakage is minimized.

I claim as my invention:

1. An interlocking milling cutter comprising, in combination, a pair ofdisk shaped sections arranged side by side in axial alinement, saidsections being provided with interiitting projections on the adjacentfaces thereof, veach of said sections having a series oi radiallyprojecting teeth thereon with a peripheral cutting edge fashioned oneach tooth, said cutting edges being alternately spiraled in oppositedirections, and each of the cutting edges on the teeth of one of saidsections being spiraled in the same direction as the correspondingcutting edges on the teeth of the other section and generally alinedtherewith.

2. An interlocking milling cutter comprising, in combination, a pair ofdisk shaped sections arranged side by side in axial alinement, saidsections being provided with interfltting projections on the adjacentside faces thereof, each of said sections having a series of radiallyprojecting teeth thereon with a peripheral cutting edge fashioned oneach tooth, and each of the cutting edges on the teeth of one of saidsections being generally alined with and forming in effect acontinuation of the corresponding cutting edges on the teeth of theother section.

3. An interlocking milling cutter of the type embodying two axiallyalined disk shaped sections having equal numbers of peripheral teeththereon and having interiitting projections on the adjacent faces of thesections, characterized by the provision of a generally spiraled periphferal cutting edge on each tooth fashioned lso that each such cuttingedge on the teeth of one of the sections spirals in the same directionas the edge on the corresponding tooth on the other section.

4. An interlocking milling cutter comprising,

each of the cutting` edges on the teeth of one of said sections beingspiraledin the same direction as the corresponding cutting edges on theteeth of the other section and generally alined therewith, the teeth oneach section being stag- 5 gered with respect to each other, andalternate teeth on each section being located with a part of the cuttingedge thereon overlapping the path traversed by the next succeeding toothon the other section during rotation of the cutter. l0

5. An interlocking milling cutter comprising, in combination, a pair ofaxially alined disk shaped sections, means fashionedon the abuttingfaces of said sections for interlocking the same, said sections havingtwo sets of gashes 15 formed on their peripheries and spiraled inopposite directions and with each of the gashes extending across bothsections, said gashes defining peripheral spiraled cutting edgesextending across both sections and with successive ones of 20 thecutting edges spiraled in the opposite direction with respect to thenext adjacent cutting edges, and the cutting edges on each section beingstaggered with respect to each other with a partfot each alternate oneof the cutting edges 25 overlapping the path traversed by the nextsucceeding cutting edge on the other section during rotation of thecutter.

6. An interlocking milling cutter comprising, in combination, a pair ofaxially alined disk 30 shaped sections, means fashioned on the abuttingfaces of said sections for interlocking the same, said sections havingtwo sets of gashes formed on their peripheries and spiraled in oppositedirections and'with each of the gashes extending 35 across bothvsections, said gashes deiining peripheral spiraled cutting edgesextending across both sections, and the leading portion of each cuttingedge being offset slightly ahead of the, trailingportion of the cuttingedge on the adjacent section.

7. An interlocking side milling cutter comprising, in combination, a.pair of disk shaped sections arranged side by side in axial alinement,intertting projections on the adjacent side faces 5 of said sections,each of said sections having a series of radi-ally projecting teeththereon with a peripheral cutting edge fashioned on each tooth, each ofthe cutting edges on `the teeth of one of said sections being generallyalined with cor- 50 responding cutting edges on the teeth of the othersection, and at least a part of said teeth on both sections having sidecutting edges fashioned on the outer sides thereof.

8. An interlocking side milling cutter com- '55 prising, in combination,a pair of disk shaped sections arranged side by side in axial alinement,interiitting projections on the adjacent side facesl of said sections,each of said sections having a series of radially projecting teeththere- 30 on staggered with respect to each other and with a peripheralcutting edge fashioned on each tooth, said cutting edges beingalternately spiraled in opposite directions, each of the cutting edgeson the teeth of one of said sections 65 being spiraled in the samedirection as the corresponding cutting edges on the teeth of the othersection and generally alined therewith, and the outwardly projectingside portions of said teeth having side cutting edges formed thereon.

v GEORGE F. WHITMAN.

